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I. Precautions during operation of the refrigeration system: The expansion valve is one of the four major components of the refrigeration system. It is an important device for regulating and controlling the flow and pressure of the refrigerant into the evaporator. It is also the \"demarcation line\" on the high and low pressure side. Its adjustment is not only related to the normal operation of the entire refrigeration system, but also an important indicator of the operator's skill level. The adjustment of the expansion valve must be performed carefully and patiently. The adjustment of the pressure must take place through the evaporator and the temperature of the warehouse to produce boiling (evaporation), and then enter the compressor suction chamber through the pipeline to reflect on the pressure gauge, which requires a time process.

Cold ton (RT): A unit of air-conditioning refrigeration. Cold ton is also known as frozen ton. Frozen ton refers to the energy required to freeze one ton of water into ice. (Note: 1 cold ton is the cooling capacity required to make 1 ton of 0 ° C water into 0 ° C ice in 24 hours.) 1 ton of 0 ° C water can be converted into 0 ° C ice in 24 hours , Frozen tons represent the refrigeration capacity of the freezer. Horsepower (HP): The number of horsepower (PH) in air-conditioning cooling capacity is calculated in kilocalories or watts (W). Generally speaking, 1PH = 2000 kilocalories, multiplied by 1.16 in international units. Calculate 2500W as the standard 1PH in daily life. 23 represents a small horse; the cooling area is 10-14 square meters. 26 stands for 1 horse; cooling area is 14-18 square meters. 32 represents a small 1.5 horse; the cooling area is 18-22 square meters. 35 represents plus 1.5 horses; refrigeration area is 22-25 square meters

Precautions for the use and maintenance of quick-freezing cold storage: 1. Prevent the freezing and thawing cycle, freezing and freezing of the building structure. 2. Protect the floor from frost and damage. 3. In the use of quick-freezing warehouses, the freezing and refrigerating capacity should be brought into full play in accordance with the design requirements, ensuring safe production and product quality, and maintaining the cold-storage building structure. The warehouse should set up a special team to manage, and the responsibility should be implemented by everyone, every warehouse door, every piece of equipment and tools.

Attentions for the installation of quick-freezing cold storage: 1. The foundation of the quick-freezing cold storage is affected by low temperature, and the moisture in the soil is easily frozen. Due to the volume expansion of the soil after freezing, it will cause ground rupture and deformation of the entire building structure, which will seriously make the cold storage unusable. For this reason, in addition to an effective heat insulation layer, the floor of the quick freezing cold storage must be treated under the heat insulation layer to prevent the soil from freezing. 2. The installation of quick-freezing cold storage uses stainless steel plate, embossed aluminum plate, colored steel plate, and composite plastic steel plate as the panel, rigid polyurethane foam plastic as the insulation material, and the composite wall panel is made by advanced technology. Good performance, corrosion resistance, anti-aging and moth-proofing, non-toxic, non-mildew, it can show its superiority when used at lower temperature. The inner and outer panels of the board are made of colored steel (the base material is galvanized steel). The core of the board is foamed rigid polyurethane or pasted polystyrene foam board. Since all components except the ground are